Grinding-mill



(No Model.) 3 Sheets-Sheet 1. S. HUGHES.

GRINDING MILL.

N0. 438,728. Patented Oct. 21, 18.90.

TNE NORRIS PETERS co., PNUYD-LITNCL, WASNYNGTON, m c.

(No Model!) a Sheets-Sheet 2.

S.HUGHES. GRINDING MILL.

No. 438,728. Patented Oct. 21, 1890.

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(No Model.) 3 SheetsSheet 3. S. HUGHES.

, GRINDING MILL. No. 438,728. Patented 001;. 21, 1890.

$13 Giro emu UNITED STATES PATENT OFFICE.

SAMUEL HUGHES, OF CHARLESTON, SOUTH CAROLINA.

GRlNDlN G -MlLL.

SPECIFICATION forming part of Letters Patent No. 438,728, dated October 21, 1890.-

Application filed July 22, 1890.

To all whom it may concern:

' Be it known that I, SAMUEL HUGHES, of Charleston, in the county of Charleston and State of South Carolina, have invented certain new and useful Improvements in Grinding-Mills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in grinding-mills, and is designed more particularly for pulverizing ores, rock, &c., its object being to so construct a mill of the class described that the pivotally-supported shafts which carry the grinding-rollers shall have a freedom of movement and said rollers be prevented from lagging or swinging backward.

A further object is to provide a grindingmill with improved driving devices, and to so locate said drivers that the pivotal bearin g of the roll-shafts shall be relieved of strain.

A further object is to provide means for forcing dust or pulverized material through the screens of the mill.

A further object is to so construct the mill that dust or pulverized material will be prevented from lodging in the pivotal bearings of the parts.

With these objects in view the invention consists in certain novel features of construction and combinations and arrangements of parts, as hereinafter set forth, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a sectional view of my improved mill. Fig. 2 is a view partly in section showing the frame-work for supporting the mill, the mill being shown constructed and particularly adapted for grinding gritty substances. Fig. 3 is a plan view of the mill with the supporting-frame removed. Fig. 4: is a view in side elevation of the bottom driver. Fig. 5 is a plan View of the same. Fig. 6 is a plan view of the bar carrying stirrers. Fig. 7 is a side view of same.

The main frame of the apparatus is composed of base or supporting timbers A, uprights B, and connecting-timbers 0. Located in the main frame and having a flange a, adapted to rest on the base-timbers A, is a Serial No. 359,529. (No model.)

receptacle 1, provided interiorly with a shoulder 1), upon which an annular die 2 is located. Secured upon the receptacle 1 is an annular ring 3, adapted to produce a chamber 4, said annular ring being provided at its top and bottom with flanges c d, the flange 0 being secured to the walls of the receptacle 1, and the upper flange d, having'a circular plate 5 bolted thereto, as shown in Fig. 1. The plate 5is provided in proximity to its periphery with a downwardly projecting flange f, adapted to extend, preferably, somewhat below the flange d of ring 3. Fixed at its upper edge to the flange fot the plate 5 and at its lower edge to the flange c of ring 3 is a band 6, of sheet metal or other suitable material, thus forming a space or chamber 7,-

surrounding the band 3, which latter is provided throughout its circumference with a series of openings covered with suitable screening material, whereby a series of screens g is produced, through which powdered material may pass into the chamber 7, as presently explained.

Two hoppers 8, having inclined bottoms, communicate with the chamber 7 for the reception of powdered material, said material being conveyed from the mill by means of a chute or chutes 9, communicating with said hoppers. In the drawingsI have shown two hoppers and spouts; but it is evident that a greater number may be employed, if desired. The plate 5 is provided interiorly with an upwardly-projecting annular flange h, to which a band 10 is secured, and produces the upper portion of the casing of the mill.

While the construction of the casing as above described is a convenient manner of making it, it is evident that said casing may be varied to any desired extent without affecting the scope of my invention.

Passing vertically through the crossbars O.

of the main frame and journaled in suitable boxes 11 on said cross-bars is a vertical shaft 12, said shaft being provided at points above the cross -bars with adjustable collars 13, adapted to bear on the cross-bars or the journal-boxes secured thereto and maintain said shafts in proper position. Secured to the shaft 12 at a point in close proximity to the top of the mill-casing is a top driver 14, from which two shafts 15, carrying rolls 16, are suspended, as presently explained. The driver 14 is provided at its center with a perforated boss 16, through which the main shaft 12 passes, a notch 16 being provided to receive a key, by which the driver is secured to the shaft, and the latter terminates at its lower end at a pointin proximity to the pan or receptacle 1. A cross-bar 18, provided centrally with a perforated boss 19, is placed on the lower end of the main shaft 12, and adapted to be adjustable thereon, a set-screw 12 being passed through said boss to engage the shaft whereby to secure said cross-bar in a fixed position. Made in the crossbar 18 in proximity to its ends are elongated slots t, and to the under face of said bar the flanges t" of stirrers 20 are located, said stirrers being bent outwardly at their lower ends and terminating at their lower ends in the receptacle at points below the annular die 2. The stirrers 20 are secured in position by means of suitable bolts j, which pass through the flanges 'i' of the stirrers and through the elongated slots tin the cross-bar, the heads of said bolts being seated upon suitable washers 7. Thus it will be seen that the stirrers 20 are adjustably secured to the cross-bar. Curved stirrers 21 are secured to the bottom faces of the rolls 16, and projecting downwardly therefrom act in conjunction with the stirrers 20 to keep the material in the pan thoroughly agitated.

The top driver 14 is provided at opposite sides of the perforated boss 16 with journalboxes 23 23 24 24 for the reception of the journals or trunnions 25 of sleeves 26. The upper ends of the shafts 15 are passed through the upper driver 14 between the journal-boxes 23 23 24 24, respectively, and through the sleeves 26, said shafts being provided at or near their upper ends with collars 27, which are adj ustably secured to said shafts by means of set-screws 28, the lower ends of said collars being adapted to rest upon the upper ends of the oscillating sleeves 26.

At a point near the lower ends of the oscillating shafts 15 and in proximity to the grinding-rolls 16 said oscillatory shafts are connected with the main shaft by means of a bottom driver 29. The driver 29 maybe conveniently made, as shown in Figs. 4 and 5, in which figures 3O 31 represent two side plates, each provided with a semicircular flange 32 33, which together produce a collar adapted to encircle the main shaft 12, the flange 32 being provided with a recess 34 for the reception of a key by means of which to secure the driver to the main shaft. The side plates 31 are connected at their ends by means of bolts 35, said plates being maintained at suitable distances apart by means of sleeves 36, located between them and encircling the bolts 35. The plates 30 31 are connected at their center and clamped to the main shaft by means of bolts 37. In the spaces between the bolts 35 and 37 boxes 38 are located, which boxes maybe made in two parts, as shown in Fig. 5, and provided in their opposing faces with recesses 39 for the reception of plates 30 31, and said boxes permitted to have a sliding movement between said plates. The sliding boxes 38 embrace the oscillatory shafts 15, or, more properly speaking, wearing-collars 40, fitted on said shafts. By this construction the driver 29 may be readily removed when the parts wear, and the worn parts easily and quickly replaced by new ones. By the employment of the driver 29, located and connected to the shafts, as above described, all strain will be removed from the pivotal bearings of the oscillatory shafts 15, permit them to vibrate freely, and prevent the rolls from lagging or swinging backward when gyrated within and against the circular die 2.

It will be readily seen that without the employment of a driver located as the driver 29 is located freedom of action of the rolls cannot be obtained, for the reason that the rolls, being forcibly held against the ring-die, will be retarded to a great extent and a sidewise strain brought to bear upon the pivoted bearings overhead, thus hindering free vibration and to a certain extent chocking the rolls.

A fan 41, made, preferably, of sheet metal, having its vanes projecting upwardly, is socured to and projects from the upper driver 14 and revolves with it. One-half of the fan 41 being on each side of the driver 14, the whole fan forms a top or cover for the mill.

The rock or other material to be ground is introduced into the mill through a suitable spout 42 above the screens, and after being pulverized by the rolls 16 in an obvious manner passes through the screens into the space or chamber 7, and finally discharged over the inclined bottoms of the hoppers S and through the spouts 9. Any approved. means may be employed for feeding material to and conveying it from the mill. During the passage of the material through the mill the fan 41 will operate to blow the dust or pulverized material through the screens into the space 7 and then to the hoppers 8 or other suitable conveyer. The fan 41 being located at the top of the mill, it will prevent the dust or pulverized material from rising to the pivotal bearings and from escaping at the top of the mill.

The mill, as shown in Fig. 2, is particularly adapted for pulverizlng gritty material. In this form of the invention the bottom driver is located at a point above the screens instead of in line therewith, as shown in Fig. 1, and just below this driver a disk-fan 43 is located, being secured to a flanged collar 44, secured to the main shaft 12. Then thelower fan 43 is employed, the upper fan serves to force air down into the mill, and at the same time is useful as a cover to the mill, as previously stated, while the lower fan protects the boxes of the lower driver from the gritty material being pulverized.

IIO

Having fully described my invention, what I claim as new, and desire to secure by Let ters Patent, is-

1. In a grinding-mill, the combination, with a receptacle and a die therein, of a main rotary shaft, oscillatory shafts carrying grinding-rolls, and drivers, with which the oscillatory shafts have pivotal and sliding connections, respectively, substantially as set forth.

2. In a grinding-mill, the combination, with a receptacle and a die therein, of oscillatory shafts carrying grinding-rolls, a main shaft, and a driver, with which said shafts have sliding connection and located in proximity to the grinding-rolls and with which the oscillatory shafts have sliding connection, substantially as set forth.

3. In a grinding-mill, the combination, with a receptacle and a die therein, of a main rotary shaft, stirrers connected to the main shaft and projecting into the receptacle, oscillatory shafts connected with and driven by the main shaft, and grinding-rolls carried by the oscillatory shafts, substantially as set forth.

4. In a grinding-mill, the combination, with a receptacle and a die therein, of a main shaft, stirrers adj ustably connected to the man shaft and projecting into the receptacle, oscillatory shafts connected with and driven by the main shaft, and grinding-rolls carried by the oscillatory shafts, substantially as set forth.

5. In a grinding-mill, the combination, with a receptacle and a die therein, of a main shaft, a cross-bar on said main shaft, stirrers secured to said cross-bar and projecting into the receptacle, oscillatory shafts connected with and driven by the main shaft, and grindingrolls carried by the oscillatory shafts, substantially as set forth.

6. In a grinding-mill,the combination,with a receptacle and a die therein, of a main shaft, a cross-bar on said main shaft, stirrers adj ustably secured to the said cross-bar and projecting into the receptacle, oscillatory shafts connected with and driven by the main shaft, and grinding-rolls carried by the oscillatory shafts, substantially as set forth.

7. In a grinding-mill, the combination, with a receptacle and a die therein, of a main shaft, a cross-bar adj ustably secured to the main shaft, laterally-adj ustable stirrers secured to said cross-bar and projecting into the receptacle, oscillatory shafts connected with and driven by the main shaft, and grinding-rolls carried by the oscillatory shafts, substantially as set forth.

8. In a grinding-mill, the combination, with a receptacle and adie therein, of a main shaft, stirrers connected to said main shaft and projecting into the receptacle, oscillatory shafts connected with and driven by the main shaft, grinding-rolls carriedby the oscillatory shafts, and stirrers carried by the grinding-rolls, substantially as set forth.

9. In a grinding-mill, the combination, with a receptacle, a die located therein, and a casing, of a main shaft, a driver carried by said main shaft, oscillatory shafts carried by said driver, grinding-rolls carried by said oscillatory shafts, and a fan carried by said driver and forming a top for the casing of the mill, substantially as set forth.

10. In a grinding-mill, the combination, with areceptacle, a die therein, and amain shaft, of

an upper driver carried by the main shaft,

oscillatory shafts carried by the upper driver, rolls carried by the oscillatory shafts, alower driver connecting the oscillatory shafts with the main shaft at points between their ends, sliding boxes carried by said driver and adapted to embrace the oscillatory shafts, and wearing-collars on the oscillatory shafts, substantially as set forth.

11. In a grinding-mill, the combination, with a receptacle and a die located therein, of a cas ing on said receptacle, a ring around said casing to produce a chamber, screens in the casin g forming a communication between the said chamber and the interior of the mill, outlets communicating with said chamber, oscillatory shafts, rollers carried by said shafts, stirrers on said rollers, and drivers for driving said shafts, substantially as set forth.

12. In a grinding-mill, the combination, with a receptacle, a die located therein, and a cas ing, of a main shaft, a driver carried thereby, oscillatory shafts carried by said driver, a fan carried by said driver at the top of the casing, a fan carried by the main shaft at a point below the first-mentioned fan, and rolls carried by the oscillatory shaft, substantially as set forth.

13. In a grinding-mill, the combination, with a receptacle, a die therein, and a casing having screens therein, of a main shaft, an upper driver carried thereby, oscillatory shafts carried by said driver, rollers carried by the oscillatory shafts, a fan carried by the upper driver, a fan carried by the main shaft at a point above the screens in the casing, and adriver connecting the main shaft with the oscillatory shafts at points above the last mentioned fan, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses. 5

SAML. HUGHES.

Witnesses:

W. B. S. WHALEY, W. F. TAYLOR. 

